Source : Webster's Revised Unabridged Dictionary (1913)

Saltire \Sal"tire\, n. [F. sautoir, fr. LL. saltatorium a sort
   of stirrup, fr. L. saltatorius saltatory. See {Saltatory},
   {Sally}, v.] (Her.)
   A St. Andrew's cross, or cross in the form of an X, -- one of
   the honorable ordinaries.

Source : WordNet®

saltire
     n : a cross with diagonal bars of equal length [syn: {St.
         Andrew's cross}]